specific gravity

barngeatbayman · 08/26/2007, 05:46 PM

what is everyone's favorite specific gravity level for a reef tank with fish. I was thinking of starting off at 1.025, what do you all think?

jer77 · 08/26/2007, 06:23 PM

I believe the recommended specific gravity is 1.026. This is the natural specific gravity on average.

http://www.reefkeeping.com/issues/2004-05/rhf/index.php

mgraigy · 08/26/2007, 07:22 PM

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[SIZE=3]I visited my local saltwater fish store over the weekened and they told me that between 1.025 and 1.028 was a good specific gravity level and I was always told 1.025 and they told me that the sea has a specific gravity level of 1.028[/

Mavrk · 08/26/2007, 07:41 PM

SG changes with temperature. Many hydrometers are calibrated to 68 degrees F which puts SG at 1.026 for 35 PPT (natural seawater). I won't get into it here because this has been discussed a lot.

I use a refractometer (around 50 dollars) and go for 35 PPT and don't concern myself with the SG.

mgraigy · 08/26/2007, 07:47 PM

[/COLOR]

[SIZE=3]I visited my local saltwater fish store over the weekened and they told me that between 1.025 and 1.028 was a good specific gravity level and I was always told 1.025 and they told me that the sea has a specific gravity level of 1.028[/

barngeatbayman · 08/26/2007, 08:50 PM

I am using a refractometer as well and there is a conversion on left side to specific gravity thats why I referred to it

Mavrk · 08/26/2007, 09:12 PM

what does your refractometer read at 35 PPT? that is what I use. mine reads 1.026 (conversion at 68 degrees F). If you are using a refractometer, don't worry about SG, just use PPT

Hope that helps.

Mavrk · 08/26/2007, 09:13 PM

By the way, for FO, people often use lower salinity (I don't).

08/26/2007, 05:46 PM	#1
barngeatbayman Premium Member Join Date: Mar 2007 Location: freehold, nj Posts: 380	specific gravity what is everyone's favorite specific gravity level for a reef tank with fish. I was thinking of starting off at 1.025, what do you all think?

08/26/2007, 06:23 PM	#2
jer77 Phish Lover Join Date: Dec 2004 Location: Pittsburgh, PA Posts: 2,642	I believe the recommended specific gravity is 1.026. This is the natural specific gravity on average. http://www.reefkeeping.com/issues/2004-05/rhf/index.php __________________ - Jonny -, 120g 5 Year Old Reef w/ SPS, BTA, Zoos & some Softies. 40g Frag Tank. 40g Sump. Super Reef Octopus XP 3000 External Cone Skimmer. 250W Radiums. TaoTronics LED. PanWorld 200PS w/SQWD

08/26/2007, 07:22 PM	#3
mgraigy Premium Member Join Date: Jul 2006 Location: Rotonda West Fl. Posts: 17	Specific Gravity Level [/COLOR] [SIZE=3]I visited my local saltwater fish store over the weekened and they told me that between 1.025 and 1.028 was a good specific gravity level and I was always told 1.025 and they told me that the sea has a specific gravity level of 1.028[/ __________________ "All we are is two lost souls swimming in a fish bowl year after year" Current Tank Info: 55 gal and 95 gal reef wave tank

08/26/2007, 07:47 PM	#5
mgraigy Premium Member Join Date: Jul 2006 Location: Rotonda West Fl. Posts: 17	Specific Gravity Level [/COLOR] [SIZE=3]I visited my local saltwater fish store over the weekened and they told me that between 1.025 and 1.028 was a good specific gravity level and I was always told 1.025 and they told me that the sea has a specific gravity level of 1.028[/ __________________ "All we are is two lost souls swimming in a fish bowl year after year" Current Tank Info: 55 gal and 95 gal reef wave tank

08/26/2007, 07:41 PM	#4
Mavrk Registered Member Join Date: Jul 2007 Location: California - South Bay Area Posts: 2,775	SG changes with temperature. Many hydrometers are calibrated to 68 degrees F which puts SG at 1.026 for 35 PPT (natural seawater). I won't get into it here because this has been discussed a lot. I use a refractometer (around 50 dollars) and go for 35 PPT and don't concern myself with the SG.

08/26/2007, 08:50 PM	#6
barngeatbayman Premium Member Join Date: Mar 2007 Location: freehold, nj Posts: 380	I am using a refractometer as well and there is a conversion on left side to specific gravity thats why I referred to it

08/26/2007, 09:12 PM	#7
Mavrk Registered Member Join Date: Jul 2007 Location: California - South Bay Area Posts: 2,775	what does your refractometer read at 35 PPT? that is what I use. mine reads 1.026 (conversion at 68 degrees F). If you are using a refractometer, don't worry about SG, just use PPT Hope that helps.

08/26/2007, 09:13 PM	#8
Mavrk Registered Member Join Date: Jul 2007 Location: California - South Bay Area Posts: 2,775	By the way, for FO, people often use lower salinity (I don't).